Fix compiler to work without deprecation on ruby 2.4 #885
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Forwardable in ruby 2.4 prints a deprecation warning if forwarding
to a private method (preview2 actually raises an exception).
Haml::Engine forwards precompiled_method_return_value to
Haml::Compiler, so the easiest way to fix this is to make
Haml::Compiler#precompiled_method_return_value public.